Threading apparatus and threading method in a textile machine

Abstract

An apparatus and method for threading a yarn onto a draw texturing machine comprising a main frame ( 20 ) provided with twisting devices ( 5 ) and second heaters ( 13 ) and a winding frame ( 22 ) provided with winding devices ( 10 ) are disposed sandwiching an operator's aisle ( 21 ) therebetween. A yarn (Y) leaving the second heater is guided along the operator's aisle to the winding device mounted on the winding frame. The second heater ( 13 ) has a yarn threading slit ( 13 a ) formed therein, and a guiding pipe ( 34 ) having a spiral cross section and yarn disengaging slit ( 34 a ) formed therein is disposed adjacent to the yarn threading slit ( 13 a ). Along the operator's aisle ( 21 ), an extendable yarn guide pipe ( 41 ) and a fourth movable yarn feed roller device ( 7 ) are disposed. A yarn feed tube ( 51 ) provided with a yarn feed nozzle ( 51 a ) is disposed between the extended end of the yarn guide pipe ( 41 ) and the winding device ( 10 ). The apparatus and method of the invention allows an operator to thread the yarn around the operator's aisle without bending.

What is claimed is:  
     
       1. A yarn threading apparatus in a textile machine comprising: 
       a main frame provided with twisting devices and heaters disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to the winding device disposed on said winding frame,  
       characterized in that 
       a yarn guide pipe is disposed extendably and retractably along said operator's aisle,  
       a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide is retracted and that it moves to a stand-by position when said guide pipe is extended, and  
       a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device.  
     
     
       2. A yarn threading apparatus according to  claim 1 , characterized in that said heater is a non-contact type high temperature heater which is capable of being heated at a temperature between 250 and 600° C. 
     
     
       3. A yarn threading apparatus in a textile machine comprising: 
       a main frame provided with twisting devices and heaters disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided beneath said operator's aisle to the winding device disposed on said winding frame,  
       characterized in that 
       said heater is provided with yarn threading slit extending along a yarn passage, and  
       a guide member which is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit, whereby while the yarn is guided from said guide member to said winding device passing beneath said operator's aisle, said yarn is disengaged from said guide member and is threaded into said heater through said yarn threading slit.  
     
     
       4. A yarn threading apparatus according to  claim 3 , characterized in that said guide member is a pipe with a spiral cross section which is disposed adjacent to said heater and which is provided with a yarn removing slit extending along the yarn passage. 
     
     
       5. A yarn threading apparatus in a textile machine comprising: 
       a main frame provided with twisting devices and heaters disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to the winding device disposed on said winding frame,  
       characterized in that 
       said heater is provided with a yarn threading slit extending along a yarn passage,  
       a guide pipe member with a spiral cross section and provided with a yarn removing slit extending along the yarn passage is disposed adjacent to said yarn threading slit, and said member is engageable with and disengageable from said yarn prior to being threaded into said heater,  
       a yarn guide pipe is disposed extendably and retractably along said operator's aisle,  
       a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide is retracted and that it moves to a stand-by position when said guide pipe is extended, and  
       a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device.  
     
     
       6. A yarn threading apparatus according to  claim 5 , characterized in that a member is disposed downstream of said heater which member engages with the yarn running inside of said guide pipe member, which member disengages said yarn from said guide pipe member through said yarn removing slit and which member threads said yarn into said heater through said yarn threading slit. 
     
     
       7. A yarn threading apparatus according to  claim 1  or  4 , characterized in that said yarn guide pipe is provided with a yarn feed nozzle. 
     
     
       8. A yarn threading apparatus in a textile machine comprising: 
       a winding device and a threading device disposed in front of said winding device,  
       characterized in that said threading device comprises: 
       a yarn feed tube provided with a yarn feed nozzle;  
       a guide member extending between a front end of said yarn feed tube and a position in front of said winding device; and  
       a yarn guide bar locating between said guide member and said winding device and extending in a traversing direction of said winding device, and  
       said guide member is provided with:  
       a bottom surface which extends from said front end of said yarn feed tube and an end of which opposite to said yarn feed tube is smoothly curved toward said winding device over said guide bar; and  
       side walls projecting from both sides of said bottom surface towards said winding device, wherein the height of said side walls of said guide member increases from said front end of said yarn feed tube to another end opposite to said yarn feed tube.  
     
     
       9. A yarn threading apparatus according to  claim 8 , characterized in that said front end of said yarn feed tube locates at a fulcrum of traverse motion of said winding tube. 
     
     
       10. A yarn threading apparatus according to  claim 8 , characterized in that a suction device is disposed between said guide bar and said winding device. 
     
     
       11. A yarn threading apparatus in a textile machine comprising: 
       a main frame provided with twisting devices and heaters disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices and threading devices disposed in front of said winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to said winding device disposed on said winding frame,  
       characterized in that 
       said heater is provided with a yarn threading slit extending along a yarn passage,  
       a guide pipe member with a spiral cross section and provided with a yarn removing slit extending along the yarn passage is disposed adjacent to said yarn threading slit, and said member is engageable with and disengageable from said yarn prior to being threaded into said heater,  
       a yarn guide pipe is disposed extendably and retractably along said operator's aisle,  
       a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide pipe is retracted and that it moves to a stand-by position when said guide pipe is extended, and  
       a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device, and  
       said threading device comprises:  
       a yarn feed pipe provided with a yarn feed nozzle;  
       a guide member extending between a front end of said yarn feed tube and a position in front of said winding device; and  
       a yarn guide bar locating between said guide member and said winding device and extending in a traversing direction of said winding device, and said guide member being provided with:  
       a bottom surface which extends from said front end of said yarn feed tube and an end of which opposite to said yarn feed tube is smoothly curved toward said winding device over said guide bar; and  
       side walls projecting from both sides of said bottom surface towards said winding device.  
     
     
       12. A yarn threading apparatus according to  claim 11 , characterized in that the height of said side walls of said guide member increases from said front end of said yarn feed tube to another end opposite to said yarn feed tube. 
     
     
       13. A yarn threading apparatus in a textile machine comprising: 
       a main frame provided with twisting devices and yarn feed rollers disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn travels beneath said operator's aisle,  
       characterized in that 
       said main frame has heaters mounted below said feed rollers, characterized in that the heater is provided with yarn threading slit extending along a yarn passage, and a guide member which is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit, and said guide member is provided with a slit through which said yarn is disengaged from said guide member so as to be threaded into said heater; and  
       a guide pipe provided with a yarn feed nozzle is disposed along said operator's aisle, and a yarn feed tube provided with a yarn nozzle is disposed between an end of said guide pipe near the winding frame to the winding device, so that the yarn from said main frame is threaded onto the winding device.  
     
     
       14. A method for threading a yarn on a textile machine comprising: 
       a main frame provided with twisting devices and heaters disposed downstream of said twisting devices; and  
       a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to the winding device disposed on said winding frame, wherein  
       said heater is provided with a yarn threading slit extending along a yarn passage,  
       a guide pipe member having a spiral cross section and provided with a yarn removing slit extending along the yarn passage, which member is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit,  
       a yarn guide pipe is disposed extendably and retractably along said operator's aisle,  
       a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide is retracted and that it moves to a stand-by position when said guide pipe is extended, and  
       a yarn feed pipe provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device, characterized in that  
       a yarn end is positioned at the entrance of said guide pipe member, and  
       the yarn is guided by means of effect of said yarn feed nozzle from said guide pipe member to said winding device through said guide pipe,  
       then, said yarn is disengaged from said guide pipe member through said yarn removing slit, and  
       the thus disengaged yarn is threaded into said heater through said yarn threading slit.